Springless door-lock.



0. BROWN.

SPBINGLESS DOOR- LOCK.

APPLICATION FILED AUG. 15, 1911.

Patented Sept. 3, 1912 wmeotoeo COLUMBIA PLAQOGRAPH co., WASHINGTON. D.6:

CLAUDE BROWN, 0F ATTICA, INDIANA.

SPRINGLESS DOOR-LOCK.

Specification df Letters Patent.

Application filed August 15, 1911.

Patented Sept. 3, 1912.

Serial No. 644,217.

T 0 all whom it may concern:

Be it known that I, CLAUDE BROWN, citi- Zen of the United States,residing at Attica, in the county of Fountain and State of Indiana, haveinvented certain new and useful Improvements in Springless Door- Locks,of which the following is a specification.

My invention relates to mortise locks and the primary object of myimprovement is the provision of a simple, cheap and durable lock of thischaracter in which a weight is used for projecting the bolt instead of aspring. Springs are weak and vary in tension one spring from another,and as they are used lose their tension, whereas a weight exerts acertain power at all times and does not vary no matter how long theweight may be in use.

A further object is to provide means for positively locking the bolt inits projected position by the provision of a member m0vable by means ofa key into or out of looking engagement with the rear end of the bolt,and which when in locked position is interposed between the bolt and anabutment, positively preventing the rearward movement of the bolt untilsaid locking member is actuated by the key.

Other objects will appear in the course of the following description.

My invention is illustrated in the accompanying drawings wherein:

Figure 1 is a vertical sectional view of a mortise lock casing with myimproved mechanism disposed therein. Fig 2 is a like view to Fig. 1showing the parts in a different position. Fig. 3 is a verticaltransverse section on the line 3-3 of Fig. 1. Fig. 4 is a verticaltransverse section on i the line 4-4 of Fig. 1. Fig. 5 is a perspectiveview of the tumbler.

Referring to the drawings, 2 designates the casing of the lock, 3 theface plate thereinner end being formed with a laterally projecting lug8.

is a cylindrical actuating member 9 having a polygonal passage 10extending longitudinally through it to receive the shank 10 of a knobwhereby the bolt may be projected or retracted. The cylindricalactuating member 9 isprovided with the oppositely projecting lugs 11whichengage with the lugs 8. When the member 9 is so disposed that thelugs 11 are in a vertical position, the bolt'will be projected. When thememher 9 is turned to the position shown in Fig.

2, the bolt will be retracted.

Pivotally mounted within the casing 2 above the shank of the bolt 5 is aweight 12. This weight has approximately the form of a segment of acircle and is pivoted near its outer margin as at 13. The lower marginof the weight is cut away as at 14 so as to accommodate the yoke 7, and

the lower edge of the weight near its forward end is'formed with arecess 15 deshoulder 17 formed by the enlarged head 5" of the bolt. Whenthe bolt is moved to the position shown in Fig. 2, as by turning themember 9, the weight will be turned upon its pivot 18 and lifted to theposition shown in Fig. 2. When the knob connected to the? Fig. 1. Thebolt is thus projected not by a spring but by the weight 12.

The side plate of the lock is provided with a keyhole 18.

Mounted in the rear of the casing 2 is a tumbler 19. This tumbler has abroadly angular form and consists of the straight portion 20, anangularly bent portion 21 and an angularly bent portion 22. At the upperend of the angularly bent portion 22 the tumbler is curved in anapproximate semicircle to form a barrel 23. The lower portion 20 of thetumbler normally bears against and slides upon the rear plate 24 of thecasing. The port-ion 20 of the tumbler is formed at its middle with anoutwardly projecting lug 25 and the lower extremity of the tumbler onits inner face is formed with a slightly circular recess 26.

Passing through the lowerportion of the casing and adjacent the rearedge thereof and approximately opposite to the lower arm of the yoke 7is a transversely extending pin 27 forming an abutment. This pin isspaced from the rear plate 24 of the casing a distance just equal to thewidth of the lower end of the tumbler at the notch or recess 26 so thatwhen the tumbler is in the position shown in Fig. 2, it will be interposed between the abut-ment 2'7 and the rear plate of the casing.Alsoextendingthrough the casing at about the middle thereof and adjacentto the rear plate 24 is a guide pin 28 against which the forward edge ofthe tumbler bears and slides. When the key is inserted in the keyopening 18 and turned, it will engage with the upper end of the tumblerand as the key is turned theupper end of the tumbler will be raised andforced rearward. Upon turning the key the first movement will be toraise the tumbler and the lower end will be withdrawn from be hind theabutment 27. As the key continues its movement in the direction of thearrow, Fig. 1, the upper end of the tumbler will be forced rearward,thus rocking the tumblerupon the fulcrum point 29. As the key descendsin its turning movement, the tumbler will be lowered so that its lowerend will be brought into position between the abutment 27 and the rearend of the yoke 7 as shown in dotted lines in Fig. 1. In this position,

the lug or shoulder 25 on the forward face of the tumbler will engagewith the rear end of theupper arm of the yoke 7. In this position thetumbler will positively pre vent any retraction of the bolt and willlock the bolt in its projected position until the tumbler is withdrawnfrom its engagement and returned to the position shown in Fig. 2 by areverse mot-ion of the key to that previously described.

It is to be noted that the weight 12 at its rear end is formed with anextension 30 which when the weight is lowered engages against the upperface of the shoulder 25 and assists in holding the tumbler in itslowered and projected position, that is, the position shown in dottedlines in Fig. 1.

While I may use any suitable means for warding the lock and anysuit-able key, I have shown for illustration a key 31, the bit of whichis formed with the oppositely disposed lateral notches 32, and the edgeof which is formed with the medially disposed notch 33. The hooked orterminal end 23 of the tumbler is of a size permitting it to enter thenotch 33 as shown in F ig. 3. I have likewise provided a ward 35 whichprojects from the casing and is in alinement with one of the notches 32when the key is in place. It will be seen that this will prevent theoperation of the look by a key not notched to provide for passing theward 35. It will also be seen that the notch or recess 33 in the edge ofthe keybit will engage with the rib 34: so that as the key is turned thetumbler will not slip out of engagement with the key.

The practical operation of my invention will be obvious from what hasgone before. Under normal circumstances and when the bolt is not locked,the parts are in the position shown in full lines in Fig. 1. Under thesecircumstances the knob may be turned to retract the bolt 5, and as theknob is turned the weight will be lifted. When the knob is released, theweight will force the bolt out. Then it is desired to lock the door, thekey is so turned as to lift the tumbler 19, look it upon the fulcrum 29and depress it to the dotted line position, Fig. 1, the bolt being ofcourse projected by the weight 12. When it is desired to unlock thedoor, the key is reversely turned to lift the tumbler out of itsposition in front of the abutment 27, then rock the tumbler upon itsfulcrum point and depress it behind the abutment 27.

My invent-ion is simple, can be applied to a large number of differentforms of lock, will not readily get out of order, and it will be seenthat no spring is required to actuate the bolt.

What I claim is:

1. A look of the character described including a longitudinallyshiftable bolt, a weight pivotally mounted above the bolt and having itsfree end engaging the bolt to urge it to its projected position, an abutment behind the bolt, and a key actuated tumbler shiftable to positionbetween the weight and the bolt, said tumbler having a portionprojecting beneath and engaged with the weight when in. its boltengaging position, the weight thereby impeding the shifting of thetumbler.

2. A look of the character described, including a longitudinallyshiftable bolt, a weight pivotally mounted above the bolt and having itsfree end engaging with the bolt, said weight being cut away on its lowerside adjacent to its rear end, an abutment behind the bolt, means forretracting the bolt against the force of said weight, and a rockingvertically shiftable key-actuated tumbler movable into or out ofposition between the abutment and the rear end of the bolt, said tumblerhaving a projecting portion engagingbeneath and supporting theprojecting end of the weight when the tumbler is in position between theabutment and the bolt whereby the weight impedes the shifting of thetumbler.

3. A look of the character described including a casing, alongitudinally shiftable bolt therein, means for yieldingly projectingthe bolt, means for manually retracting the bolt against the force ofsaid projecting means, an abutment, and an angularly shaped tumbler, keyactuated and having a vertically sliding and rocking engagement betweenits fulcrum and the rear of the casing, said tumbler being movable by akey into or out of position behind the abutment and into or out ofposition between the abutment and the rear end of the bolt.

4. A look of the character described including a casing, alongitudinally shiftable bolt therein, an abutment spaced from the rearend of the casing and disposed behind the bolt, means for yieldinglyprojecting the bolt, means for retracting the bolt against the force ofsaid projecting means, and a tumbler, shaped angularly to provide afulcrum and having a sliding and rocking engagement with the rear wallof the casing, said tumbler having a key engaging terminal upper endwhereby upon a rotation of the key the tumbler will be rocked againstthe rear end of the casing and withdrawn from behind the abutment andprojected into position between the abutment and the rear end of thebolt.

5. A look including a casing, a longitudinally shiftable bolt located inthe lower portion of the casing, a weight urging the bolt to itsprojected position, means for manually retract-ing the bolt, an abutmentdisposed behind the bolt and spaced from the rear wall of the casing,and a tumbler, shaped angularly to provide a fulcrum on its rear facehaving sliding and rocking engagement with the rear wall of the casing,the lower end of the said tumbler being adapted to engage behind theabutment or between the abutment and the rear end of the bolt, saidtumbler at its upper end being formed with a key engaging terminalwhereby the tumbler may be lifted and rocked upon a rotation of the key'to withdraw the tumbler from its position behind the abutment and toproject the tumbler to a position between the abutment and the rear endof the bolt.

6. A look including a casing, a longitudinally shiftable bolt mounted inthe lower end of the casing, a segmental weight pivoted within thecasing and engaging the bolt to urge it to its projected position, saidweight having a rearwardly extending projection extending beyond therear end of the bolt, means for manually retracting the bolt against theaction of the weight, an abutment located behind the bolt and spacedfrom the rear wall of the casing, and a tumbler, shaped angularly toprovide a fulcrum upon its rear face having rocking and slidingengagement with the rear wall of the casing, the lower end of thetumbler being insertible between the abutment and the casing or betweenthe abutment and the rear end of the bolt, the forward edge of thetumbler being provided with a forwardly projecting lug adapted when thetumbler is turned to a locking position to engage beneath the projectingend of the weight, the upper end of the tumbler being provided with acircular barrel forming a key engaging terminal end, the side wall ofthe casing being formed with a key opening registering with the interiorof the barrel.

In testimony whereof, I aflix my signature in presence of two witnesses.

CLAUDE BROWN.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents. Washington, D. C.

